218 lines
7.8 KiB
Python
218 lines
7.8 KiB
Python
# Copyright © 2017 Tom Hacohen
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#
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# This program is free software: you can redistribute it and/or modify
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# it under the terms of the GNU Affero General Public License as
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# published by the Free Software Foundation, version 3.
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#
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# This library is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program. If not, see <http://www.gnu.org/licenses/>.
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from pathlib import Path
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from django.db import models, transaction
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from django.conf import settings
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from django.core.validators import RegexValidator
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from django.db.models import Q
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from django.utils.functional import cached_property
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from django.utils.crypto import get_random_string
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Base64Url256BitlValidator = RegexValidator(regex=r'^[a-zA-Z0-9\-_]{42,43}$', message='Expected a base64url.')
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UidValidator = RegexValidator(regex=r'^[a-zA-Z0-9]*$', message='Not a valid UID')
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class Collection(models.Model):
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main_item = models.ForeignKey('CollectionItem', related_name='parent', null=True, on_delete=models.SET_NULL)
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owner = models.ForeignKey(settings.AUTH_USER_MODEL, on_delete=models.CASCADE)
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def __str__(self):
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return self.uid
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@cached_property
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def uid(self):
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return self.main_item.uid
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@property
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def content(self):
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return self.main_item.content
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@property
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def etag(self):
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return self.content.uid
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@cached_property
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def stoken(self):
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stoken = Stoken.objects.filter(
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Q(collectionitemrevision__item__collection=self) | Q(collectionmember__collection=self)
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).order_by('id').last()
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if stoken is None:
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raise Exception('stoken is None. Should never happen')
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return stoken.uid
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class CollectionItem(models.Model):
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uid = models.CharField(db_index=True, blank=False,
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max_length=43, validators=[UidValidator])
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collection = models.ForeignKey(Collection, related_name='items', on_delete=models.CASCADE)
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version = models.PositiveSmallIntegerField()
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encryptionKey = models.BinaryField(editable=True, blank=False, null=True)
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class Meta:
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unique_together = ('uid', 'collection')
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def __str__(self):
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return '{} {}'.format(self.uid, self.collection.uid)
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@cached_property
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def content(self):
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return self.revisions.get(current=True)
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@property
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def etag(self):
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return self.content.uid
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def chunk_directory_path(instance, filename):
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item = instance.item
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col = item.collection
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user_id = col.owner.id
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item_uid = item.uid or 'main'
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return Path('user_{}'.format(user_id), col.uid, item_uid, instance.uid)
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class CollectionItemChunk(models.Model):
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uid = models.CharField(db_index=True, blank=False, null=False,
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max_length=43, validators=[Base64Url256BitlValidator])
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item = models.ForeignKey(CollectionItem, related_name='chunks', on_delete=models.CASCADE)
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chunkFile = models.FileField(upload_to=chunk_directory_path, max_length=150, unique=True)
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def __str__(self):
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return self.uid
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def generate_stoken_uid():
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return get_random_string(32, allowed_chars='abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789-_')
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class Stoken(models.Model):
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uid = models.CharField(db_index=True, unique=True, blank=False, null=False, default=generate_stoken_uid,
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max_length=43, validators=[Base64Url256BitlValidator])
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class CollectionItemRevision(models.Model):
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stoken = models.OneToOneField(Stoken, on_delete=models.PROTECT)
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uid = models.CharField(db_index=True, unique=True, blank=False, null=False,
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max_length=43, validators=[Base64Url256BitlValidator])
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salt = models.BinaryField(editable=True, blank=False, null=False, default=b'')
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item = models.ForeignKey(CollectionItem, related_name='revisions', on_delete=models.CASCADE)
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meta = models.BinaryField(editable=True, blank=False, null=False)
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current = models.BooleanField(db_index=True, default=True, null=True)
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deleted = models.BooleanField(default=False)
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class Meta:
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unique_together = ('item', 'current')
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def __str__(self):
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return '{} {} current={}'.format(self.uid, self.item.uid, self.current)
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class RevisionChunkRelation(models.Model):
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chunk = models.ForeignKey(CollectionItemChunk, related_name='revisions_relation', on_delete=models.CASCADE)
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revision = models.ForeignKey(CollectionItemRevision, related_name='chunks_relation', on_delete=models.CASCADE)
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class Meta:
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ordering = ('id', )
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class AccessLevels(models.TextChoices):
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ADMIN = 'adm'
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READ_WRITE = 'rw'
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READ_ONLY = 'ro'
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class CollectionMember(models.Model):
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stoken = models.OneToOneField(Stoken, on_delete=models.PROTECT, null=True)
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collection = models.ForeignKey(Collection, related_name='members', on_delete=models.CASCADE)
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user = models.ForeignKey(settings.AUTH_USER_MODEL, on_delete=models.CASCADE)
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encryptionKey = models.BinaryField(editable=True, blank=False, null=False)
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accessLevel = models.CharField(
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max_length=3,
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choices=AccessLevels.choices,
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default=AccessLevels.READ_ONLY,
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)
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class Meta:
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unique_together = ('user', 'collection')
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def __str__(self):
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return '{} {}'.format(self.collection.uid, self.user)
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def revoke(self):
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with transaction.atomic():
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CollectionMemberRemoved.objects.update_or_create(
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collection=self.collection, user=self.user,
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defaults={
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'stoken': Stoken.objects.create(),
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},
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)
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self.delete()
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class CollectionMemberRemoved(models.Model):
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stoken = models.OneToOneField(Stoken, on_delete=models.PROTECT, null=True)
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collection = models.ForeignKey(Collection, related_name='removed_members', on_delete=models.CASCADE)
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user = models.ForeignKey(settings.AUTH_USER_MODEL, on_delete=models.CASCADE)
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class Meta:
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unique_together = ('user', 'collection')
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def __str__(self):
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return '{} {}'.format(self.collection.uid, self.user)
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class CollectionInvitation(models.Model):
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uid = models.CharField(db_index=True, blank=False, null=False,
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max_length=43, validators=[Base64Url256BitlValidator])
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version = models.PositiveSmallIntegerField(default=1)
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fromMember = models.ForeignKey(CollectionMember, on_delete=models.CASCADE)
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# FIXME: make sure to delete all invitations for the same collection once one is accepted
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# Make sure to not allow invitations if already a member
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user = models.ForeignKey(settings.AUTH_USER_MODEL, related_name='incoming_invitations', on_delete=models.CASCADE)
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signedEncryptionKey = models.BinaryField(editable=False, blank=False, null=False)
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accessLevel = models.CharField(
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max_length=3,
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choices=AccessLevels.choices,
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default=AccessLevels.READ_ONLY,
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)
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class Meta:
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unique_together = ('user', 'fromMember')
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def __str__(self):
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return '{} {}'.format(self.fromMember.collection.uid, self.user)
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@cached_property
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def collection(self):
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return self.fromMember.collection
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class UserInfo(models.Model):
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owner = models.OneToOneField(settings.AUTH_USER_MODEL, on_delete=models.CASCADE, primary_key=True)
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version = models.PositiveSmallIntegerField(default=1)
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loginPubkey = models.BinaryField(editable=True, blank=False, null=False)
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pubkey = models.BinaryField(editable=True, blank=False, null=False)
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encryptedContent = models.BinaryField(editable=True, blank=False, null=False)
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salt = models.BinaryField(editable=True, blank=False, null=False)
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def __str__(self):
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return "UserInfo<{}>".format(self.owner)
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